[PATCH AUTOSEL 5.10 1/4] perf data: Fix error return code in perf_data__create_dir()

From: Sasha Levin
Date: Wed Apr 28 2021 - 07:12:03 EST


From: Zhen Lei <thunder.leizhen@xxxxxxxxxx>

[ Upstream commit f2211881e737cade55e0ee07cf6a26d91a35a6fe ]

Although 'ret' has been initialized to -1, but it will be reassigned by
the "ret = open(...)" statement in the for loop. So that, the value of
'ret' is unknown when asprintf() failed.

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Signed-off-by: Zhen Lei <thunder.leizhen@xxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lore.kernel.org/lkml/20210415083417.3740-1-thunder.leizhen@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
tools/perf/util/data.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
index c47aa34fdc0a..5d97b3e45fbb 100644
--- a/tools/perf/util/data.c
+++ b/tools/perf/util/data.c
@@ -35,7 +35,7 @@ void perf_data__close_dir(struct perf_data *data)
int perf_data__create_dir(struct perf_data *data, int nr)
{
struct perf_data_file *files = NULL;
- int i, ret = -1;
+ int i, ret;

if (WARN_ON(!data->is_dir))
return -EINVAL;
@@ -51,7 +51,8 @@ int perf_data__create_dir(struct perf_data *data, int nr)
for (i = 0; i < nr; i++) {
struct perf_data_file *file = &files[i];

- if (asprintf(&file->path, "%s/data.%d", data->path, i) < 0)
+ ret = asprintf(&file->path, "%s/data.%d", data->path, i);
+ if (ret < 0)
goto out_err;

ret = open(file->path, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
--
2.30.2